04113224 is referenced by 242 patents and cites 4 patents.

Apparatus for and method of forming ophthalmic lenses and/or semi-finished lens blanks including those of the eye contact type. The apparatus includes molds having cooperating first and second members each of which includes a longitudinal axis and a mold surface which is symmetrical with respect to such axis. In one embodiment these mold members or halves also include cooperating surfaces which, in operation and in cooperation with the selected lens material, both align the respective mold axes and axially position the mold surface of the first member with respect to the mold surface of the second member to thereby form the desired lens mold cavity. Further, each of the assembled molds also includes an annular reservoir which surrounds the mold cavity and is defined by surfaces provided on the first and second mold members. This reservoir is connected to the mold cavity via an annular restriction. In one embodiment this restriction is defined by the cooperating aligning surfaces provided on the first and second mold members.

In operation, the reservoir holds a volume of lens material which, during the polymer forming reaction, is kept in a flowable state longer than the lens material in the mold cavity. This arrangement permits the transfer of lens material between the reservoir and the mold cavity during curing. Apparatus is also provided for removing selected portions of the cast lens in those instances where removal is either necessary or expedient.

Title
Apparatus for forming optical lenses
Application Number
466933
Publication Number
4113224
Application Date
January 27, 1977
Publication Date
September 12, 1978
Inventor
Richard J Wrue
Rochester
NY, US
Donald V Livesey
Rochester
NY, US
James A Clark
Honeoye Falls
NY, US
Agent
DeWitt M Morgan
Frank C Parker
Assignee
Bausch & Lomb Incorporated
NY, US
IPC
B29D 11/00
B29C 5/00
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